can an active enzyme be turned back to a zymogen?

[NOA]

Thank you so much!

Also, is it true that NADH oxidation requires oxygen reduction?

[BabcockHall]

What are your thoughts on these two questions? I'll give you a frame of reference for your first question: consider what would happen chemically to convert chymotrypsinogen into chymotrypsin. With respect to your second question, can you think of any reactions that require NADH as a reactant?

EDT

Think about reactions from glycolysis/gluconeogenesis that produce or consume NADH. Also there are at least three common fates of pyruvate that has been produced from glycolysis. Do any of these processes involve NADH?

Edited July 8, 2017 by BabcockHall